Final answer:
A similarity between Hinduism and Buddhism is reincarnation; both believe that the soul is reborn after death into a new life, influenced by one's karma.
Step-by-step explanation:
A similarity between Hinduism and Buddhism is C) Reincarnation. Both religions share the belief in samsara, the cycle of birth, death, and rebirth, in which an individual's soul is reborn into a new life after death. This cycle continues until one attains a state of liberation: Moksha in Hinduism and Nirvana in Buddhism. Actions in one's life, known as karma, influence the nature of the reincarnation and the life circumstances into which one is born. This cycle of birth, death, and rebirth continues until the soul achieves enlightenment or liberation. Reincarnation is a fundamental concept in both Hinduism and Buddhism, although their interpretations and beliefs about the specifics of reincarnation may differ.